StarSharp Bahtinov Focus Masks

StarSharp Bahtinov Focus Masks

  (48 Reviews)
✓ 2 year warranty


1x in stock shipped 1-2 working days

About this product

Model:  bahtinov-130p
Part Number:  130SHORT

These are not generic masks. Each is tuned to the telescope's focal ratio for best performance smiley

FLO manufactures StarSharp Bahtinov focus masks in-house, so if the mask for your telescope is not in stock, we can have one ready for you in only 2-4x working days. 

The Bahtinov mask has become the preferred method of focusing a telescope visually or when imaging with a CCD camera, DSLR or webcam. Precise and repeatable focus can be achieved in under a minute, even in poor seeing conditions.

The mask displays a unique diffraction profile; one part of the diffraction pattern moves in response to changes in focus and displays an error as a displacement from a clearly defined point.


  • Quick and easy to add and remove from the telescope.
  • The straight sides ensure the focus mask will not roll away when stored on the shelf.
  • Matt-black surfaces prevent reflections. 
  • A reflective, high-visibility corner makes it easy to locate the mask and to check you haven't left it on the telescope. 

Credit goes to Russian amateur astronomer Pavel Bahtinov for creating the Bahtinov and for making it available to the astronomy community. 

Made in the UK!  



Customer reviews

Average Rating (48 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Should do the Job
17 December 2023  | 

Not used in anger yet as all my FLO astrogear checks so far have been indoors I’m sorry to say. However, it seems well made/printed and will hopefully work as expected when I venture outside! I’m just a bit concerned about it ‘hanging’ off the end of the ‘scope on two bolts (hence 4 star rating for the time being) although it seems well located when the elevation is polar orientated and above. Carefully packed along with other items in one FLO shipment as expected.

Rating (max 5):  
C8 Bahtinov Mask
29 October 2023  | 

This is well made and works as it should because it's made for a C8, not generic

Rating (max 5):  
It works
27 August 2023  | 

Needed to replace my old one which was eaten by the dog !! Works a treat, perfect for my celestron edge HD 8 👍

Rating (max 5):  
Service and delivery
11 August 2023  | 

Had question about the product's suitability for my telescope, quickly answered by FLO. Ordered on the back of the answer, quickly dispatched and received. Why would you go anywhere else for astroomy products.

Haven't used the mask in anger yet, but it is sturdy enough and Im sure it will do its job just fine.

Rating (max 5):  
Thank FLO
16 April 2023  | 

Great turn around thank FLO

Rating (max 5):  
23 March 2023  | 

Mask itself seems as mentioned but I ravaged all of my packaging 3 times, ripped every bit of plastic and cardboard where the mounting screws could have gotten but to no avail. Mine did not come with anything to mount it with so yeah, hard to say anything about it working... A good paperweight though!


We are sorry to hear the bolts have been lost - please get in touch and we will send out replacements asap.

Rating (max 5):  
10 February 2023  | 

FlO were very helpful, fast delivery, and a great product..recommend.

Rating (max 5):  
22 December 2022  | 

The mask has 3 holes and 2 screw in pins. This gives you the choice to have the diffraction spikes either vertical or horizontal. Which ever suites your eye best. The small label on the mask shows which way is which. Simply hang on the front of the telescope and focusing is made simple and incredibly accurate. Works even better with a Crayford focuser.

Rating (max 5):  
Bahtinov Mask
15 September 2022  | 

Poor, simple hang off the end mask with 2 plastic bolts. Mine doesn't even sit centred. Sits almost 1cm too low.
Case of buy cheap buy twice here.


They are designed to hang on the end like this - this works perfectly in practice and bahtinov masks do not need to sit centred to work.

You don't mention the functionality at all but you will find the mask works perfectly and offers a cost effective solution.

Rating (max 5):  
Works well, but feels like this item is missing a 3rd plastic skrew for attachement
09 September 2022  | 

Everything as expected, but as there are three holes but only two plastic screws included, it would sit better on the telescope with three plastic screws. The material seems slightly simple, but appears to do the job well.


If there were three bolts then one of them would never be in use - these are designed to hang on top of the telescope using two bolts. There are three holes to allow for adjustment / choice of orientation and where the reflective strip is.

Read all 48 customer reviews...


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